CN2660236Y - Device of increasing magnetic liquid sealing pressure durable abilities of reciprocating shaft - Google Patents
Device of increasing magnetic liquid sealing pressure durable abilities of reciprocating shaft Download PDFInfo
- Publication number
- CN2660236Y CN2660236Y CN 200320125014 CN200320125014U CN2660236Y CN 2660236 Y CN2660236 Y CN 2660236Y CN 200320125014 CN200320125014 CN 200320125014 CN 200320125014 U CN200320125014 U CN 200320125014U CN 2660236 Y CN2660236 Y CN 2660236Y
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- CN
- China
- Prior art keywords
- magnetic liquid
- pole shoe
- bearing
- reciprocating shaft
- sealing pressure
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- Expired - Fee Related
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- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
A device is used to improve the sealing pressure capacity of magnetic liquid of reciprocating axis. In assembly, a bearing (3), a pole shoe (6) inlaid with a rubber seal ring (5) and a permanent magnet (7) are arranged on the right side of an internal cam of a sleeve (2) and a magnetic liquid (9) is injected among pole teeth of the pole shoe (6); then a pole shoe (8) inlaid with the rubber seal ring (5) is arranged and the magnetic liquid (9) is injected among pole teeth of the pole shoe (8); and a bearing (10), a regulating gasket (11) and a ring flange (13) are fixed by a bolt (12) for compacting the above parts; finally, a shaft (14) coated with a nano anti-friction membrane (4) is arranged. The utility model has the advantages that the sealing pressure capacity of the magnetic liquid is increases, the leakage rate is less than 10<-11>pa1.m-11/s, and the service life is extended.
Description
Technical field
The utility model belongs to the mechanical engineering technical field of sealing technology, is specially adapted to the reciprocating shaft magnetic liquid sealing.
Background technique
The reciprocating shaft magnetic liquid sealing is different from the running shaft magnetic fluid sealing, and its sealing voltage endurance capability is subjected to the influence of frictional force size between reciprocating shaft and magnetic liquid.The material of existing reciprocating shaft is a permeability magnetic material, generally adopts steel No. 45, and magnetic liquid has certain wettability on No. 45 steel surfaces.Along with speed increases, the shear rate between reciprocating shaft and magnetic liquid increases, and frictional force also increases.When frictional force was big, the amount of the magnetic liquid that reciprocating shaft is taken away when to-and-fro motion was more, and the distortion that the magnetic liquid in the utmost point backlash takes place increases, and made magnetic liquid film both sides field strength values descend, and caused the voltage endurance capability of seal arrangement to descend, even lost efficacy.
Summary of the invention
Technical problem to be solved in the utility model is, frictional force between existing reciprocating shaft magnetic liquid seal shaft and magnetic liquid is bigger, causes the voltage endurance capability of seal arrangement to descend, even loses efficacy, therefore, provide a kind of device that improves reciprocating shaft magnetic liquid sealing voltage endurance capability.
The technical solution of the utility model: plate nanometer antifriction thin film coating on the reciprocating shaft surface, the frictional force between magnetic liquid and the reciprocating shaft is descended greatly, thereby the magnetic liquid distortion is little, voltage endurance capability is greatly improved.
The device that improves reciprocating shaft magnetic liquid sealing voltage endurance capability comprises: cover, bearing, rubber seal, permanent magnet, pole shoe, nanometer antifriction film, magnetic liquid, screw, adjusting pad, flange plate, axle.On the surface, relevant position of the axle between the end face of the two bearings outside, process the groove that the degree of depth is 0.1mm, plate the nanometer antifriction film that a layer thickness is the polytetrafluoroethylmaterial material of 0.1mm at groove.Earlier rubber seal is embedded in the pole shoe during installation, then bearing, the pole shoe of the intact rubber seal of embedding and the inner convex platform right side that permanent magnet is installed to cover, magnetic liquid is injected between the utmost point tooth of pole shoe, reinstall another pole shoe of the intact rubber seal of embedding, between the utmost point tooth of this pole shoe, inject magnetic liquid, load onto another bearing then, regulate pad and flange plate, be screwed, above part is compressed, load onto the axle that is coated with nanometer antifriction film at last.Magnetic liquid is adsorbed under the effect in magnetic field in the utmost point backlash of pole shoe, forms reliable sealing.
The beneficial effects of the utility model are, after the reciprocating shaft surface plates one deck nanometer antifriction thin film coating, have improved the voltage endurance capability of magnetic liquid, and the leak-down rate of this device is lower than 10
-11Palm
3/ s, prolong working life.
Description of drawings
Fig. 1 improves the structure drawing of device of reciprocating shaft magnetic liquid sealing voltage endurance capability
Fig. 2 A partial structurtes enlarged view
Among the figure: tapped hole 1, cover 2, bearing 3, nanometer antifriction film 4, rubber seal 5, pole shoe 6, permanent magnet 7, pole shoe 8, magnetic liquid 9, bearing 10, screw 11, adjusting pad 12, flange plate 13, axle 14.
Embodiment
With the accompanying drawing is that the utility model is described in further detail for embodiment:
The device that improves reciprocating shaft magnetic liquid sealing voltage endurance capability comprises: cover 2, bearing 3, nanometer antifriction film 4, rubber seal 5, pole shoe 6, permanent magnet 7, pole shoe 8, magnetic liquid 9, bearing 10, screw 11, adjusting pad 12, flange plate 13, axle 14.Earlier rubber seal 5 is embedded in pole shoe 6 and the pole shoe 8 during installation, successively bearing 3, embedding are finished the pole shoe 6 of rubber seal 5 and the inner convex platform right side that permanent magnet 7 is installed to cover 2 then, magnetic liquid 9 is injected between the utmost point tooth of pole shoe 6, reinstall the pole shoe 8 of the intact rubber seal 5 of embedding, between the utmost point tooth of pole shoe 8, inject magnetic liquid 9, load onto bearing 10 then, regulate pad 11 and flange plate 13, fixing with screw 12, above part is compressed, load onto the axle 14 that is coated with nanometer antifriction film 4 at last.Magnetic liquid 9 is adsorbed under the effect in magnetic field in the utmost point backlash of pole shoe 6 and pole shoe 8, forms reliable sealing.
On the surface, relevant position of the axle 14 between bearing 3 left sides and bearing 10 right sides, process the groove that the degree of depth is 0.1mm, plate the nanometer antifriction film 4 that a layer thickness is the polytetrafluoroethylmaterial material of 0.1mm at groove, because teflon cannot not have stickingly characteristic, so plate teflon the magnetic liquid when to-and-fro motion, taken away of axle amount seldom, make the frictional force between magnetic liquid 9 and the reciprocating shaft 14 reduce very big, the magnetic liquid distortion is little, thereby has improved the voltage endurance capability of magnetic liquid.
Regulate pad 11 and when assembling, be used to adjust axial distance.Tapped hole 1 is in order to link to each other with other devices and to design.
Cover 2, regulate pad 11 and screw 12 is all made by nonmagnetic substance, as stainless steel etc.Axle 14 material selection permeability magnetic material is as No. 45 steel etc.
The symmetrical configuration of pole shoe 6 and pole shoe 8 is established the groove of placing rubber seal 5 on external cylindrical surface, pole shoe 6 and pole shoe 8 both sides end faces respectively design a boss, and the effect of a boss is to isolate magnetic circuit, prevents that magnetic liquid 9 is adsorbed onto bearing 3 or bearing 10; Another boss is the position of fixing permanent magnet 7.Pole shoe 6 and pole shoe 8 material selection electrical pure irons.
Bearing 3 is identical with bearing 10 models.
Permanent magnet 7 is selected rubidium iron boron or SmCo or aluminium nickel cobalt material for use according to the requirement of true temperature, selects rubidium iron boron under the normal temperature for use, and temperature is selected SmCo for use in time below 300 ℃, and temperature is aluminium nickel cobalt in the time of 400 ℃.
The kind of magnetic liquid can be according to sealing gas and temperature environment different, select the magnetic liquid of different base load liquid, when assembling, once inject.
The progression of utmost point tooth determines that according to the pressure reduction condition of sealing every grade sealability is 0.5 barometric pressure.Pole shoe is 0.1～0.2mm with the gap of axle, and the facewidth of utmost point tooth is 3～5 times of gap, and tooth depth is 20～30 times of gap.
Use-case: to diameter is that the reciprocating shaft of 50mm carries out the vacuum seal design, on the surface, relevant position of the axle between the end face of the two bearings outside, process the groove that the degree of depth is 0.1mm, plate the nanometer antifriction film that a layer thickness is the polytetrafluoroethylmaterial material of 0.1mm at groove, adopt 6 grades of utmost point tooth sealings, pole shoe is 0.1mm with the gap of axle, facewidth 0.5mm, tooth depth 2.5mm, the keryl magnetic liquid of injection 5ml, permanent magnet is selected Rb-Fe-B material for use.Stroke at reciprocating shaft is 200mm, and when speed was 200rpm, the detected gas leak-down rate was less than 10 in this device using process
-11Palm
3/ s reaches 1080 hours working time.
Seal arrangement is equally applicable to positive seal.
Claims (1)
1. one kind is improved the device that reciprocating shaft magnetic liquid seals voltage endurance capability, and this device comprises: cover, bearing, rubber seal, pole shoe, permanent magnet, magnetic liquid, screw, adjusting pad, flange plate, axle; It is characterized in that, on the surface, relevant position of the axle (14) between bearing (3) left side and bearing (10) right side, process the groove that the degree of depth is 0.1mm, plate the nanometer antifriction film (4) that a layer thickness is the polytetrafluoroethylmaterial material of 0.1mm at groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320125014 CN2660236Y (en) | 2003-12-01 | 2003-12-01 | Device of increasing magnetic liquid sealing pressure durable abilities of reciprocating shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320125014 CN2660236Y (en) | 2003-12-01 | 2003-12-01 | Device of increasing magnetic liquid sealing pressure durable abilities of reciprocating shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2660236Y true CN2660236Y (en) | 2004-12-01 |
Family
ID=34349148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320125014 Expired - Fee Related CN2660236Y (en) | 2003-12-01 | 2003-12-01 | Device of increasing magnetic liquid sealing pressure durable abilities of reciprocating shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2660236Y (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101776149A (en) * | 2010-03-01 | 2010-07-14 | 北京交通大学 | Low-temperature and small-diameter magnetic fluid seal device |
| CN101776151A (en) * | 2010-03-08 | 2010-07-14 | 北京交通大学 | Reciprocating shaft magnetic liquid sealing structure |
| CN101832843A (en) * | 2010-03-12 | 2010-09-15 | 北京交通大学 | Reciprocating sealing performance test bed for magnetic liquid sealing device |
| CN102072326A (en) * | 2011-01-24 | 2011-05-25 | 北京交通大学 | Magnetic liquid sealing process researching device |
| CN102128271A (en) * | 2011-01-16 | 2011-07-20 | 北京交通大学 | Magnetic liquid sealing device capable of microwave heating |
| CN102792105A (en) * | 2010-03-17 | 2012-11-21 | 住友重机械工业株式会社 | Displacer and method for producing same, and cooling storage refrigerator |
| CN103759018A (en) * | 2014-01-17 | 2014-04-30 | 北京交通大学 | Magnetic liquid sealing device for sealing liquid |
| CN104141796A (en) * | 2014-07-04 | 2014-11-12 | 北京交通大学 | Method for increasing sealing and pressure resisting capacity of magnetic liquid by using magnetoconductivity nanowire magnetic liquid |
| CN111963688A (en) * | 2020-08-12 | 2020-11-20 | 清华大学 | Multistage multipolar magnetic powder sealing device |
| CN112377621A (en) * | 2020-11-12 | 2021-02-19 | 北京交通大学 | Magnetic liquid sealing device suitable for bidirectional micromotion of shaft diameter of high-speed rotating shaft |
| CN112963538A (en) * | 2021-04-07 | 2021-06-15 | 北京交通大学 | Magnetic powder and magnetic liquid combined sealing device |
| CN112963545A (en) * | 2021-03-19 | 2021-06-15 | 清华大学 | Magnetic liquid sealing device and assembling method thereof |
-
2003
- 2003-12-01 CN CN 200320125014 patent/CN2660236Y/en not_active Expired - Fee Related
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101776149A (en) * | 2010-03-01 | 2010-07-14 | 北京交通大学 | Low-temperature and small-diameter magnetic fluid seal device |
| CN101776151A (en) * | 2010-03-08 | 2010-07-14 | 北京交通大学 | Reciprocating shaft magnetic liquid sealing structure |
| CN101776151B (en) * | 2010-03-08 | 2011-08-03 | 北京交通大学 | Reciprocating shaft magnetic liquid sealing structure |
| CN101832843A (en) * | 2010-03-12 | 2010-09-15 | 北京交通大学 | Reciprocating sealing performance test bed for magnetic liquid sealing device |
| CN102792105B (en) * | 2010-03-17 | 2014-11-12 | 住友重机械工业株式会社 | Displacer and method for producing same, and cooling storage refrigerator |
| CN102792105A (en) * | 2010-03-17 | 2012-11-21 | 住友重机械工业株式会社 | Displacer and method for producing same, and cooling storage refrigerator |
| CN102128271A (en) * | 2011-01-16 | 2011-07-20 | 北京交通大学 | Magnetic liquid sealing device capable of microwave heating |
| CN102128271B (en) * | 2011-01-16 | 2013-02-27 | 北京交通大学 | Magnetic liquid sealing device capable of microwave heating |
| CN102072326A (en) * | 2011-01-24 | 2011-05-25 | 北京交通大学 | Magnetic liquid sealing process researching device |
| CN103759018A (en) * | 2014-01-17 | 2014-04-30 | 北京交通大学 | Magnetic liquid sealing device for sealing liquid |
| CN103759018B (en) * | 2014-01-17 | 2016-01-20 | 北京交通大学 | A kind of magnetic fluid seal device for seal fluid |
| CN104141796A (en) * | 2014-07-04 | 2014-11-12 | 北京交通大学 | Method for increasing sealing and pressure resisting capacity of magnetic liquid by using magnetoconductivity nanowire magnetic liquid |
| CN104141796B (en) * | 2014-07-04 | 2016-02-10 | 北京交通大学 | The method of magnetic fluid sealing voltage endurance capability is improved with magnetic conductivity nanowire magnetic liquid |
| CN111963688A (en) * | 2020-08-12 | 2020-11-20 | 清华大学 | Multistage multipolar magnetic powder sealing device |
| CN111963688B (en) * | 2020-08-12 | 2021-11-09 | 清华大学 | Multistage multipolar magnetic powder sealing device |
| CN112377621A (en) * | 2020-11-12 | 2021-02-19 | 北京交通大学 | Magnetic liquid sealing device suitable for bidirectional micromotion of shaft diameter of high-speed rotating shaft |
| CN112963545A (en) * | 2021-03-19 | 2021-06-15 | 清华大学 | Magnetic liquid sealing device and assembling method thereof |
| CN112963545B (en) * | 2021-03-19 | 2022-02-25 | 清华大学 | Magnetic liquid sealing device and assembling method thereof |
| CN112963538A (en) * | 2021-04-07 | 2021-06-15 | 北京交通大学 | Magnetic powder and magnetic liquid combined sealing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |